Improvement in injectors and ejectors



To all whom it may conce-rn:

Beit known that I, WILLIAM B. MACK, of y Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Injectors and Ej ectors, of which f i the following is a specification:

` Figure 1 of the accompanying drawing is a y, vertical longitudinal section of my improved i c injector or ejector. The present invention relates to certain new and useful improvements in injectors or ejectors, whereby the objection caused by the eX- pansion and weakening of the nozzle by the passage of the steam between it and the rod Vis obviated and the durable and effective `working of the apparatus is secured. My improvements consist, mainly, in a longitudc inal hollow rod or tube and valve-stem, ar- Y ranged and operated, as will be more fully del i scribed hereinafter, so as to be actuated by the g `same movement and open a valve on the rear 'end of the rod or tube, and admit, through apy ertures formed in a disk or circular plate forming the bottom of the valve-stem, a gentle and even ow of steam into the rod or tube, from 1 -the mouth of which it issues through a convtracted aperture in the desired quantity and with the requisite force into the boiler-pipe,

Y without being allowed to enter the steam-nozl zle until the water has been raised, when, by a the further action of the valve-stem, the rod or tube is operated so as to allow the full force of the steam from the boiler to flow into and t out-of the nozzle, which is relieved of the injurious consequences occasioned by the presst ure heretofore exerted by the steam passing i' between'it andthe rod when iowing through a transverse aperture formed near the end of the latter.

t In the drawing, a represents a longitudinal hollow rod or tube, formed at its mouth with a small longitudinal aperture, b, and expanding and sloping on its outer periphery at the end so astoimpingetightlyagainst orbereleasedfrom f the Vinner sloping periphery of a steam-nozzle, c. The otheror rear end of the rod or tube a v is formed with a valve, d, beveled on the bottom edge, or otherwise arranged to hug tightly, when closed, on a seat, e, formed on the interior of a. body-valve, f. The top of the valve d'is beveled or otherwise shaped to form a seat for a valve, g, connected with a stem, h,

UNITED STATES PATENT DFFICE.

-wILLIAM B MAoK, or BosToN, MAssAoHUsETTs.

IMPROVEMENT IN INJECTQRS AND EJECTORS.

Specification forming part of Letters Patent No. 133,997, dated December 17, 1872.

v which may be arranged with a screw-thread to engage with a female screw formed in a head, of the body-valvef, and operated by a wheel or crank, &c., or otherwise arranged so as to operate in and vout longitudinally. The interior of the valve d is arranged at the bottom of its periphery with a groove or slot, k, forming at the top an inner projection or flange, Z, beveled or otherwise suitably formed on its outer edge, and against the bottom of which, when the stem h is drawn out, abuts the outward face of a disk or circular plate, m, attached to or forming the bottom of the stem h, which is pressed tightly when the stem his turned in against the bottom orseat of the valve d; and thus, by the operation of the stem h, actuating forward or backward the rod or tube and opening or closing the valve d according as the stem h is carried out or in. The disk or circular plate m is formed with apertures m', through which a gentle ow of steam is admitted into the tube a by the irst outward operation of the stem h, which, at the same time that it carries the disk back against the iiange l, withdraws the valve g from its seat on the top of the valve d, and admits the desired quantity of steam from the steam-pipe o, connected with the boiler. By still further drawing out the stem h the valve d is withdrawn from its seat e, and the rod or tube a is carried back so as to release it from the mouth of the nozzle c, so as to admit and allow the free iow of the steam from the pipe o into and out ofthe nozzle c.

By referring to the drawing it will readily be seen that when the stem h is iirst turned or drawn out the valve gis withdrawn from its seat and the disk or plate mis *brought against the iiange l, leaving a small passage between the valve g and the seat,througl1 which the desired quantity of steam passes and is admitted back of the' disk m, through whose apertures mf it iiows into the tube a, and is contracted in its passage out by the small aperture b so that it gently comes in contact with the water, which is introduced through the pipe s, the bottom of the valve d,

in the meanwhile,'being held tightly against its seate; but by further turning or drawing out the stem h, the valve d is withdrawn from` its seat, and the rod or tube a is carried backward, thus admitting the full supply ofsteam from the pipe o into and out of the nozzle c into the combination pipe t.

In my previous invention, patented J' une 25,

1872, No. 128,232, and others of like nature,

where a transverse aperture is used in the end oi' the rod near the mouth of the steam-nozzle, between which and the rod the steam is admitted, the great objection is that the pressure of steam in the boiler is necessarily on the. weakest part of the nozzle-that is, at its mouth-which is liable to expand and in a short time become inoperative.

B y my improved arrangement this obj eetion is obviated by introducing the steam in the manner hereinabove described, so that the supplementary steam-jet is conveyed directly through and from the rod or tube a, which allows, when withdrawn from the mouth of the nozzle, plenty of room for the exit of the steam from the boiler; and as no steam is permitted to enter the nozzle when the rod or tube is closed it is not subjected to any injurious pressure, and the bulging form of the end of the rod or tube a. forms a steam-tight joint which prevents the escape of any steam between the rod and mouth of the nozzle before the required time, and takes up any wear of the rod ou the nozzle-mouth, so that it is rendered durable and at all times effective in its operation.

Having thus fully described my improvements, what I claim as my invention, and desire to have secured to me by Letters Patent, 1s-

l. The hollow rod a having a bulging and sloping termination, with a longitudinal hole, b, at one end, and a valve, d, at the other, when said rod is placed inside the shell B of the injector, as and for the purpose described.

2. The valve d, connected with or forming the head of a hollow rod or tube, a, of an injector or ejector, and having a beveled bottom and groove or slot, k, and beveled ilange Z, substantially as and for the purpose specified.

3. The stem h havingthe disk m, apertures m', and valve g, `iu combination with the valve Z and the injector, as and for the purpose specied.

4. In an injector or ejector, the combination of the hollow rod or tube t and stem h, arranged for operation, as herein described, with the steam-nozzle c, body-valvef, and pipe o, substantially as specified.

5. The hollow sliding stem a placed within the injector, and serving to conduct steam through the nozzle thereof at the same time that it protects the nozzle from injurious prcssure from the steam, substantially as set forth.

InV testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM B. MACK.

Witnesses:

CARROLL D. WRIGHT, SAML. M. BARTON. 

